Eperimental studies on the structure of the lower mantle and themantle fractionation

下地幔结构及上地幔分异的实验研究

基本信息

  • 批准号:
    62540621
  • 负责人:
  • 金额:
    $ 1.22万
  • 依托单位:
  • 依托单位国家:
    日本
  • 项目类别:
    Grant-in-Aid for General Scientific Research (C)
  • 财政年份:
    1988
  • 资助国家:
    日本
  • 起止时间:
    1988 至 1989
  • 项目状态:
    已结题

项目摘要

The olivine( )-modified spinel( )-spinel(y)-postspinel phase equilibria in the system Mg_2SiO_4-Fe_2SiO_4 were determined up to 26 GPA and 1600 C. It was demonstrated that the magenesian spinel (with Fe/Mg+Fe<0.2) dissociates into perovskite and magnesiowustite within an extremely narrow pressure interval (<0,15 GPa at 1600 C). The dissociation pressure is almost independent of iron content and coincide to that at 650km. These results indicate that the sharpness of the 650km discontinuity may indeed be due to this dissociation in peridotitic mantle. Assigning the phase boundaries of the spinel dissociation to the sharp discontinuity implied by study of reflected waves, the temperature at the base of the transition zone (655km depth) is estimated to be about 1600 C. Taking the dissociation of the majorite dissociation confirmed in the system CaSiO_3-MgSiO_3-Al_2O_3 and mantle peridotites into consideration, the mineralogical model was constructed down to the lower mantle.Melting experim … More ents on a fertile peridotite was performed up to 2.5 GPa and at temperatures 2000-3000 C. The MgSiO_3-rich perovskite was found to be the liquidus phase at the lower mantle conditions. Using the Mg/Si, Al/Si, Ca/Si, and Ca/Al ratio as constraints, it was shown that primitive upper mantle compositions can be derived from a chondritic source through a small degree of MgSiO_3-perovskite fractionation (10-20wt%).Crystal structure of MgSiO_3perovskite was determined at high pressures up to 9.6GPa as well as at atmospheric pressure, using single crystals. The structure was characterized by the three dimensional framework of SiO_6 octahedra with Mg in the eight-fold coordinated cuboctahedron and the unit cell compression is controlled dominantly by the tilting of SiO_6 octahedra. The singly-crystal elastic module of MgSiO_3 perovskite was determined for the first time under atmospheric pressure and room temperature using Brillouin spectroscopy. Comparison of our elasticity data with seismic models appropriste to the lower mantle reveals that petrological models having either pyrolite or pyroxene stoichiometries are compatible with the experimental data only if the shear modulus of MgSiO_3 perovskite has a very strong negative temperature derivative. Less
在Mg_2SiO_4-Fe_2SiO_4体系中,测定了橄榄石()-改性尖晶石()-尖晶石(y)-后尖晶石相平衡。结果表明,镁尖晶石(Fe/Mg+Fe<0.2)在极窄的压力区间内(1600℃时< 0.15 GPA)解离成钙钛矿和镁辉石矿。解离压力几乎与铁含量无关,与650km处的解离压力一致。这些结果表明,650km不连续的尖锐性确实可能是由于橄榄岩地幔的这种分离所致。考虑到CaSiO_3-MgSiO_3-Al_2O_3体系中证实的主晶石解离作用和地幔橄榄岩的解离作用,将尖晶石解离作用的相界设定为反射波所暗示的尖锐不连续,估计过渡带底部(65km深度)的温度约为1600℃,建立了下地幔的矿物学模型。在2000 ~ 3000℃的温度下,在2.5 GPa的温度下,对一肥沃的橄榄岩进行了熔融实验,发现富mgsio_3的钙钛矿在下地幔条件下为液态相。以Mg/Si, Al/Si, Ca/Si和Ca/Al比值为约束条件,表明原始上地幔成分可以通过少量mgsio_3 -钙钛矿分选(10-20wt%)从球粒陨石来源获得。用单晶法测定了mgsio_3钙钛矿在9.6GPa高压和常压下的晶体结构。其结构特征为SiO_6八面体与Mg在八重配位立方体内的三维框架,胞元压缩主要由SiO_6八面体的倾斜控制。首次利用布里渊光谱在常压和室温条件下测定了MgSiO_3钙钛矿的单晶弹性模。我们的弹性数据与下地幔地震模型的比较表明,只有当MgSiO_3钙钛矿的剪切模量具有很强的负温度导数时,具有软锰矿或辉石化学计量的岩石学模型才能与实验数据相容。少

项目成果

期刊论文数量(22)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Eiichi,Takahashi: Geophysical Monograph. 39. 427-437 (1987)
高桥荣一:地球物理专着。
  • DOI:
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  • 期刊:
  • 影响因子:
    0
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  • 通讯作者:
Hiroyuki,Horiuchi: Am.Mineral.72. 357-360 (1987)
堀内弘之:Am.Mineral.72。
  • DOI:
  • 发表时间:
  • 期刊:
  • 影响因子:
    0
  • 作者:
  • 通讯作者:
E.Ito.;E.Takahashi.: Nature. 328. 514-517 (1987)
E.Ito.;E.Takahashi.:自然。
  • DOI:
  • 发表时间:
  • 期刊:
  • 影响因子:
    0
  • 作者:
  • 通讯作者:
伊藤英司: 化学と工業. 40. 738-740 (1987)
伊藤英二:化学与工业。40. 738-740 (1987)
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  • 期刊:
  • 影响因子:
    0
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ITO Eiji其他文献

ITO Eiji的其他文献

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{{ truncateString('ITO Eiji', 18)}}的其他基金

Cultural similarities and differences in the effects of constraints to and constraint negotiation of leisure-time physical activity on psychological well-being
休闲体育活动约束和约束谈判对心理健康影响的文化异同
  • 批准号:
    26882037
  • 财政年份:
    2014
  • 资助金额:
    $ 1.22万
  • 项目类别:
    Grant-in-Aid for Research Activity Start-up
An Experimental Study on Early Evolution of the Earth and the Structure of the Lower mantle
地球早期演化与下地幔结构的实验研究
  • 批准号:
    17204048
  • 财政年份:
    2005
  • 资助金额:
    $ 1.22万
  • 项目类别:
    Grant-in-Aid for Scientific Research (A)
An Experimental Study on the Origin and Dynamics of the Earth's Lower Mantle
地球下地幔起源和动力学的实验研究
  • 批准号:
    13852005
  • 财政年份:
    2001
  • 资助金额:
    $ 1.22万
  • 项目类别:
    Grant-in-Aid for Scientific Research (S)
HIGH-PRESSURE EXPERIMENTAL STUDIES ON THE ORIGIN OF LAYERED STRUCTURE OF THE EARTH
地球层状结构起源的高压实验研究
  • 批准号:
    11440133
  • 财政年份:
    1999
  • 资助金额:
    $ 1.22万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B).
Experimental Studies of Early Differentiation and Evolution of the Earth
地球早期分化和演化的实验研究
  • 批准号:
    05102003
  • 财政年份:
    1993
  • 资助金额:
    $ 1.22万
  • 项目类别:
    Grant-in-Aid for Specially Promoted Research
High-pressure on the structure and dynamics of the deep earth's interior.
高压对地球深层内部结构和动力学的影响。
  • 批准号:
    01460052
  • 财政年份:
    1989
  • 资助金额:
    $ 1.22万
  • 项目类别:
    Grant-in-Aid for General Scientific Research (B)
Investigation on the linkage units between cell surface substances
细胞表面物质之间连接单元的研究
  • 批准号:
    59470128
  • 财政年份:
    1984
  • 资助金额:
    $ 1.22万
  • 项目类别:
    Grant-in-Aid for General Scientific Research (B)

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CSEDI Collaborative Research: Understanding what we see in the lower mantle - mineral physics interpretation of seismic tomographic images
CSEDI 合作研究:了解我们在下地幔中看到的东西 - 地震层析成像的矿物物理解释
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    2000801
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    2020
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Global water circulation in the Earth's interior: roles of the lower mantle on water strage and distribution
地球内部的全球水循环:下地幔对水储存和分布的作用
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    20K04109
  • 财政年份:
    2020
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CSEDI Collaborative Research: Understanding what we see in the lower mantle - mineral physics interpretation of seismic tomographic images
CSEDI 合作研究:了解我们在下地幔中看到的东西 - 地震层析成像的矿物物理解释
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    2000850
  • 财政年份:
    2020
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EAR-PF: Water in the Lower Mantle: Gaining Insight through Melt Generation and Deformation Textures
EAR-PF:下地幔中的水:通过熔化生成和变形纹理获得洞察
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    1855336
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    2019
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High Pressure-Temperature Single-Crystal Elasticity of the Lower-Mantle Bridgmanite
下地幔布里奇曼石的高压-高温单晶弹性
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    1916941
  • 财政年份:
    2019
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High-pressure-temperature phase relations of basaltic crust under lower-mantle conditions: implications for chemical heterogeneity in the lower mantle
下地幔条件下玄武岩地壳的高压-温度相关系:对下地幔化学不均匀性的影响
  • 批准号:
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高压高温下下地幔矿物物理性质的精确测量
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    19K21049
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CSEDI合作研究:通过跨学科研究了解过渡带与下地幔之间的水运移本质
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Water transport to the lower mantle and its storage capacity
下地幔的水输送及其储存能力
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